Finding the Third Proportional to 90,315 and 140,643

Step by Step Solution

1. Step 1: Write the proportion equation
   90,315 : 140,643 = 140,643 : x
2. Step 2: Convert to fraction form
   90,315/140,643 = 140,643/x
3. Step 3: Cross multiply
   90,315x = 140,643 × 140,643
4. Step 4: Simplify right side
   90,315x = 19,780,453,449
5. Step 5: Solve for x
   x = 19,780,453,449/90,315
6. Step 6: Final answer
   x = 219,016.26